Hello all, as thread title states I am looking to convert a ST-2E to a NCM-300 so I can install a Nest thermostat. The system is a 2-zone, forced hot air, natural gas system with AC. The panels look pretty identical, aside from the supply air sensor. Either way, I was curious what I would do with the "B" brown wire or "O" orange wire, as the Nest only has a O/B option and the ST-2E uses both. I provided a link below to show how the current panel is wired and a picture of the new one.
Also, if anyone has done this before, any tips or tricks would be greatly appreciated. Ive only changed panels like for like.
Post your questions and comments here.
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